Electric lamp.



C. H. FISCHER.

ELECTRIC LAMP.

APPLICATION FILED MAR. 13. I915.

Patented May 25, 1915.

(7M4, WWW

UNITED snares PATENT orricn.

CHARLES HARRYFISCHER, OF vv(Ill- BT01.NNAT-I, OHIO.

ELECTRIC LAMP.

Specification of Letters Patent;

- Patented May 25, 1915.

Application filed March 13, 1915. serial No. 14,214.

\ To all whom it may concern and useful It is a furthervobject of my invention to provide novel means whereby the electric light-bulb may be manually shifted with rev.lation to the refiector rotatively or axially- -9 rotative and axial movements, so as to adby movements which are the sums of said just the bulb with relation to the focus of surfaces, one ofwhich is shiftable with rethe reflector; further to provide means resiliently acting for retarding said movements; further to provide complemental lation tothe other, having coacting depressions and protuberances, the depressions in one of said surfaces merging into each other or being crossingly arranged for maintaining the light-bulb-in adjusted position; further to provide resilient means whereby said surfaces are :held toward each other;

bul'b has connection and a part in which said last-named part has rotative and axial .g ovements so arranged as to limit said axial "anovement and when at such limit of axial movement to prevent relative rotation beo'tween said parts; and the invention will be further readily understood from the fol lowing description and claims, and from the drawings, in which latter:

Figure 1 is an axial section of an electric lamp embodying my invention. Fig. 2 is a perspective View showing the means for attaching and focusing the electric light-bulb, the parts being shown in separated relation.

Fig. 8 is a side elevation of my improved de-- vice in assembled relation, the reflector and easing being partly broken away. Fig. 4 is an axial sectionof the same taken on a line corresponding to the line H of Fig 5, the socket-member being in rear positipn. Fig.

I is a front elevation of the central p'crtiogfi further to provide a part with which the.

of my improved device, the light bulb being removed. Fig. 6 is an axial section of my improved device, partly broken away, taken on the line 6.6 of Fig. 5, the socket-member being shown in rear position with its limiting stop in frictional contact with the wall of its guide. Fig.7 is a cross-section of my improved device taken ona line corresponding to the line 77 of Fig. 3. Fig. 8 is a .ing shown, described and claimed the same in an application for patent on electric connectors, filed July 17 1914, Serial No. 851,581.

The casing of the lamp is shown at 11.

12 is the reflector, exemplified as a parabolic reflector, secured to the casing by screws 13 for forming the body of the lamp.

The front closure is shown at 14L, exemplilied as a door provided with a glass15. The door is arranged to be suitably mounted on the body, as by hinges 16, or the casing, rcfiector and door are suitably connected together in other manner, preferably so that the front glass 14 is releasable, in order to obtain access to the electric light-bulb,wl 1ich is shown at 17, by means of whichthe nianipulation is effected, in the present eXemfiled Marchlii, 1915, Serial No. 14,215, eXecu'ted of even date herewith, in which latter application clalms are also directed to such structure. I

. A socket-member is provided, ,to which the electric light-bulb is arranged to be secured, this socket-member being instanced as a socket-tube 21 received in a central rear aperture 22 of the reflector. A flange 23 acts to support the socket-member in the line ofv the axis of the reflector. This flange exemplifies a lamp-member and is shown on a flange-piece 24 suitably rigidly secured to the reflector, as-by soldering. The socketmember has plug attaching means at one of its ends, exemplified as at its forward end, shown as bayonet slots 25 in the wall of the socket-member arranged for receiving the pins 26 of the plug 27 exemplified as the plug of the electric light-bulb. The outer periphe cry of the socket-member and the inner periphery of the flange or lamp-member therefor., are preferably annular and preferably arranged so that the. socket-member may have rotary or axial movement, or a movement which is the sum of these two movements in said flange or lamp-member, a resilient part being provided with relation to which said socket-member has movement, the latter member and said socket-member having complemental coacting surfaces arranged for permitting said movement of said socketmember and holding said socket-member in adjusted positions. Thus the socket-memher is provided with protuberances 31 "and depressions 32, the depressions extending in a plurality of directions crossing each other for forming the protuberances. The coact ing member for said surface is shown as a shoe 33, which is received through an opening 34 in the flange 23, and has an inner end provided with protuberances 36 eta-aepressions 37 coacting with the protuberances and depressions on said socket-memb enji The shoe is mounted on a spring 38,;sh own as a band-spring, curved to be received about the flange, the band preferably extending more than half way around the flange, so

that it will be retained on said fla e by its spring pressure'and arranged to 17eleasably received thereabout. The endfo'f the spring is curved outwardly as shown at 39, so that the spring may be readily pushed about the flange. The spring urgesthe'shoe 33 toward the socket-member for continuously maintaining resilient contact between said shoe and said socket-member. A plurality of protuberances on one of said coacting position-maintaining parts ispreferably received in a plurality of the depressions of the other ofsaid parts so as to maintain said parts in relatively adjusted relations. Proximate protuberances and depressions are closely adjacent to eachother for providing minuteness of focal adjustment:

A terminal post 41 is arranged to be pressed toward the light-bulb by a spring 42. The post 'has axial movement in a bushing 40 in an insulating washer 43, clamped to the socket-tube 21 by a cap 44 screwed about the outer threaded end of the socket-tube. The plug of the light-bulb is arranged to be received in its socket, so that, in forming the bayonet connection therewith, its terminal 45 will press the post 41 axially for making good electric connection therewith, -the spring 42 resisting this axial movement.

The holding properties of the spring 38' and the position-retaining means for .the socket-member will ordinarily not be sufin rotary and axial lines in connecting the plug with the socket-member, in consequence of which the socket-member will be pushed axially by the plug. This axial movement is, in the present exemplification, a rearward movement. This axial movement of the ficient to counteract the manual force exerted socket-member is limitedby providing it with a stop, shown as a lip 46, which is arranged to be received in a recess 47 at the inner end of the guide in which the socketmember moves, a plurality of these recesses being shown. (See Figs. 3, 4and 5). The recesses are preferably shallow so as to arrest the lengthwise movement of the lip. When the-lip is received in a recess, rotation of the socket-piece will also be limited, whereby a turning of the light-bulb in its socket can u be effected for causing the pins to be received in or removed from the lateral portions of the bayonet slots. A slight inward urging of the socket-member, after connection of the light-bulb therewith, will bring the lip out of the recessfor again permitting the turning of the socket-member.

If desired, the portion of the lip 46 proximate to the lamp-member, shown as the rear portion, may be made tapering, as shown at 48, whereby a wedging of the socket-member" in its guide will be effected by contact of the rear end of the lip with any portion in the circumference of the forward edge of the guide not recessed as hereinbefore men-- tioned, when the socket-member is moved rearwardly. (See Fig. 6). The forward movement of the socket-member will be limited by contact of the cap 44 with the rear end of the flange 23. The axial, rotative, and combined axial and rotative movements obtainable in my improved device afl'ord ease of manual manipulation of the lightbulb, the parts being so arranged however as to afford great resistance to unintentional shifting after adjustment.

The arrangement of my improved device suits, and for adjusting the filament into the focus of the reflector, whereby the most effective results may be obtainel.

Having thus fully described my invention, What I claim as new and desire to secure by Letters Patent, is: Q

1. In an electric lamp, the combination with a reflector, of a lamp-member, a socketmember guided by the latter, ,said socketmember having thereon retardent surfaceformations extending in a plurality of directions, and a resiliently acting positionretaining part coacting with said surfaceiormations, whereby said -socket-member is arranged to be moved manually in any direction along or about the line of the principal axis of said reflector and said positionrctaining part remaining automatically effective for retaining said socket-member in adjusted position.

2. In an electric lamp, the combination with a reflector, of a socket-member, a lampmember guiding the latter, a plug for said socket-member, spring-pressed connecting means between said socket-member and plug arranged to be connected by axial and rotative movements of said plug, position-retaining means acting resiliently on said socket-member, avhereby said socket-member is arranged to' be manually moved in any direction along or about the line of the principal axis of said reflector and said position retaining means remaining automatically eflective for retaining said socket-member in adjusted positions, and a stop for limiting movement of said socket-member in the directions of said axial and rotative movements of said plug during connecting of said plug.

3. In an electric lamp, the combination of a reflector, a lamp-member, a socket-member having movement in said lamp-member in any direction along or about the line of. the principal axis of said reflector, and resiliently acting position-retaining means con tinuously acting operatively between said members, said resiliently acting position-retaining means and socket-member provided withcoacting position-retaining surfaces one of which is formed by alternating protuberances and depressions extending cross ingly in a plurality of directions.

4. In an electric lamp, the combination of a reflector, a lamp-member, a socket-member having movement in said lamp-member in any direction along or about the line ofthe principal axis of said reflector, and resiliently acting position-retaining means .continuously acting operatively upon said socket-member, said socket-member comv prising a cylindrical portion provided with retardent surface-formations acted onre-' tardingly to said movements of said socketmember in an; L said stated directions, and said resllier Sly acting position-retaining means provided with a coacting surface.

5. In electric lamp, the combination of reflector, a lamp-member, a socket-member, a plug for the latter, spring pressed connecting means between said socket memher and plug arranged to be connected by axial and rotative movements of said plug, said socket-member having movement in said lamp-member in any? direction along or about the line of the principal axis of said reflector, and resiliently acting position-retaining means continuously acting operatively upon said socketniember, said socketmember comprising a cylindrical portion provided with retardent surface-formations acted on retardingly to said movements of said socket-member, said resiliently acting positioning means provided with a coacting surface, and a stop for l miting movement of said socket-member in the directions of said axial and rotative movements of said plug.

6. In an electric lamp, the combination of a reflector, a cylindrical flange about the line of the principal axis of said reflector, a socket-member therein guided thereby, said socket-member comprising acylindrical portion in said flange provided with alternate closely adjacent protuberances and depressions extending in a plurality of directions about said cylindrical portion, a spring-band about said flange, said flange provided with an aperture, and said springband provided with a part extending through said aperture, said-last-nam'ed part provided with a surface complemental to said protuberances and depressions, for manual movement of saidsocket-member in any direction along or about said line of said principal axis of said reflector.

7. In an electric lamp, the combination of a reflector, a cylindrical flange about the line of the principal axis of said reflector, a socket-member therein guided thereby, a plug for the latter, spring-pressed connecti-ng means between said plug and socketmember arranged to be connected by axial and rotative movements of said plug, said socket-member comprising a cylindrical por-' with a surface complemental to said protuberances and depressions, for manual movement of said socket-member in any direction along or about said line of said principal axis oil said reflector j and {instep-tor vln'mtiug 'meveme'n tof Sal socket-member in the directions of said axial and rotative movements of said plug during connecting of said plug. 3

8. In an electric lamp, the combination of a reflector, a lamp-member, a socket member therein, said members extending lengthwise of the line of the principal axis of said refloctor, and a resiliently acting position-retaining part, said last-named part and said socket-member provided With coacting surfaces comprising retardent surface-formations extending in a plurality of directions, constructed and arranged for movement of said socket-member in said lamp-member axially, rotatively, or in a direction which is the sum of said axial and rotative movements, said socket-member comprising a plug-securing portion, means for limiting axial movement of said socket-member for locating said socket-member in plug-attaching position, and means for limiting rotative movement of said socket-member when in plug-attaching position, said last-named means formed by providing one of said members With a projection and the other of said members With a coacting recess.

In testimony whereof, I have hereunto signed my name in the presence of two subscribing Witnesses.

CHAR-LES HARRY FISCHER.

lVitnesses:

CHARLES E. WEBER, THERESA M. SILBER. 

